单选题As oil pipe line connections were broken,（）quantity of oil was caused to spill onto the wharf and into the dock water.Aa not knowingBan unknowingCan unknownDa not known
单选题
As oil pipe line connections were broken,（）quantity of oil was caused to spill onto the wharf and into the dock water.
A
a not knowing
B
an unknowing
C
an unknown
D
a not known
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